All Questions

-3
votes
0answers
9 views

Early Satellite Development Survey (Research) - Takes 1-3 min

I am part of a small team at my university researching costs, time, and resources associated with early spacecraft/satellite development. The goal is to generate numerical models associated with very ...
2
votes
1answer
15 views

What happens when LOX and H2 are injected into the combustion chamber of a rocket?

I can't seem to find an answer on this. I thought that when oxygen and hydrogen get injected they collide and break bonds etc. to form water vapour which because of the pressure in the combustion ...
1
vote
1answer
21 views

Do current plans for people going to Mars by SpaceX depend only on consumables loaded from Earth?

Do current plans for people going to Mars by SpaceX depend only on consumables loaded from Earth or do they also include obtaining some materials from Mars fairly soon after arrival? Does the plan ...
3
votes
1answer
37 views

Could life return to earth from asteroid mining

Is it possible that mining on asteroids could bring life back to Earth such as bacteria?
2
votes
1answer
31 views

Ballistic missile typical trajectory - along which path is it supposed to travel between Russia, China and US?

Today I was puzzled when my son was holding a school globe asking me to show with my finger a trajectory of a (nuclear) ballistic missile flying from US to China and Russia and vice versa (from Russia ...
1
vote
0answers
19 views

Saving STK Scenario from Python app

I'm working with Python and STK integration. I need to build scenarios and save them, the problem is that I cannot find any saving example on AGI's documentation. Here is a starting point: ...
3
votes
1answer
29 views

Are there any hypergolic solid/liquid fuel combinations?

Could the principal of hypergolic fuels be applied to hybrid rockets? And if so, are there any known hypergolic solid/liquid combinations?
5
votes
0answers
28 views

What is the current state of Squeeze-suit development, as distinguished from gas-pressurized models?

This ten-year-old article on a squeezesuit concept estimates that it is ten years from completion. Ten years have passed, and this article is still the #1 hit on Google, with a couple of other ...
4
votes
1answer
43 views

Purifying perchlorate in Mars surface soil

It's known that there's a lot of perchlorate contained in Mars' surface soil. But could we take the toxic part out and make it become plantable? How to do it?
13
votes
1answer
2k views

Microphone on Mars

To the best of my knowledge, a microphone has never been sent to Mars. Why is that? We take pictures of Mars, why not sound recordings ?
1
vote
0answers
70 views

How to make the cheapest rocket, but still get to the moon? [on hold]

Have you ever heard of the old movie Salvage? The TV movie, “Salvage,” aired on January 20, 1979. The film begins with Harry successfully bidding for a vintage bi-plane and then reselling it in pieces ...
4
votes
1answer
168 views

Electricity for magnetic shield at Mars L1 Lagrange point

NASA says that it can build a magnetic dipole shield at the Mars L1 Lagrange Point, but how do they support the electricity?
1
vote
0answers
26 views

How to calculate the force drop due to multiple thrusters firing?

When multiple thrusters are connected to one pressurized propellant tank and multiple thrusters are fired simultaneously, this will cause a pressure drop in the supplying pipes and as such a drop in ...
-2
votes
0answers
42 views

The Big Bang Theory [on hold]

If you support the Big Bang,and if you agree that most explosions eject mass in all directions,and that the universe is expanding (some say even speeding up), then why is there no massive, mostly ...
1
vote
0answers
60 views

Why would a space shuttle have flown a normal first-stage and early-second-stage ascent trajectory during an RTLS abort?

Had a space shuttle suffered a main-engine failure very early on during ascent, or had a time-critical emergency (for instance, a crewmember unexpectedly having a stroke) occurred before negative ...
3
votes
1answer
67 views

Could an Apollo Lunar Module have landed and returned without Earth assistance?

From the Apollo 12 flight journal: 087:31:29 Conrad (onboard): [Laughter] Yes. Let's take the LM down and land on the back side. Wouldn't that shake them up? [Laughter]. 087:31:36 Bean (...
1
vote
2answers
83 views

Have optical zoom systems been used in space exploration?

Here, 'optical zoom' means an optical system that changes magnification (angle subtended per pixel). It would not mean for example switching from one camera to another on Hubble, or changing to ...
2
votes
1answer
80 views

How big are photos taken in space?

How big are photos taken in space? (Megapixels) Furthermore, are there any standards in regards to photo size, quality, etc or do most entities building satellites for exploration or scientific data ...
2
votes
1answer
41 views

How would one calculate the Lunar liftoff thrust required for a spacecraft?

I used the thrust to weight ratio of 2.12 to determine the thrust my spacecraft needs for a lunar liftoff, Apollo Lunar Ascent Stage Thrust to Weight Ratio. Is this a proper way of determining and ...
0
votes
0answers
31 views

Does time consists of some particles so it can be bent and in some case be twisted? If yes, what does time consist of and what does it look like? [on hold]

If a certain celestial body has a great enough mass, it has the ability to bend and in some cases twist time. For example black holes have the ability to bend time around them. Time near black holes ...
1
vote
1answer
79 views

How many companies do specialize currently in (research of) asteroid mining?

After two major players aiming at asteroid mining (not just the Moon) were bought up and repurposed, who still does follow this topic as primary business model? Deep Space Industries was bought by ...
9
votes
2answers
2k views

Pictures from Mars

How is it that NASA receives broadcasts from 300 million miles away but Sprint needs to install transmitters every 500ft for 5G wireless?
7
votes
1answer
93 views

How small must an asteroid be to burn entirely in the martian atmosphere?

The Martian atmosphere is thinner and the magnetic field isn't present. I wonder how many asteroids fall and if at least the small ones can burn in the atmosphere before reaching the soil. Thanks in ...
5
votes
0answers
77 views

How do HMX-fuelled rockets launch without exploding?

Unlike most civilian solid-fuel rockets, which use ammonium perchlorate/aluminium fuels with a rubber binder (known in the industry as ammonium perchlorate composite propellant, or APCP for short), ...
5
votes
1answer
135 views

How did the Apollo guidance computer handle the Earth-Moon system's rotation around the Sun?

In this comment I just wrote: "...but at all other times it is just doing math to calculate its trajectory." The math needed a stable clock Timing accuracy of the Apollo Guidance Computer? (also 2, ...
5
votes
1answer
155 views

Is it possible to take another Pale Blue Dot image?

Pale Blue Dot is a photograph of planet Earth taken on February 14, 1990, by the Voyager 1 space probe from a record distance of about 6 billion kilometers (3.7 billion miles, 40.5 AU), as part of ...
1
vote
2answers
212 views

Why is the earth so small when observed from the moon?

I recently discovered the pictures from DSCOVR taken at the Lunar Transit in 2016. The earth appears very massive behind the moon, which is a little unintuitive if you consider how small it is when ...
2
votes
1answer
260 views

What is the meaning of “T.M”?

In the movie, First Man (2018), Neil Armstrong is getting into Gemini 8 space craft. He overhears capcom voice: CARNARVON CAPCOM: Guaymas, read you loud and clear. We have S band track. We have ...
0
votes
0answers
41 views

Why don't astronauts/ships/stations carry portable 'magnetospheres'? [duplicate]

As I understand it, cosmic radiation is one of the biggest dangers/problems to space exploration. Some cursory research seems to suggest that it wouldn't take very strong magnetic fields to deflect ...
1
vote
1answer
179 views

What is the meaning of “Bravo”?

There is movie called, " First Man (2018), which is about Apollo 11 mission. CAPCOM-APOLLO 11 speaks to Apollo 11 crew: CAPCOM-APOLLO 11: Apollo 11, now entering lunar orbit. Your roll should ...
1
vote
0answers
77 views

Very Low Gravity Bicycle

There are a couple of existing questions about riding bicycles off of Earth. Designing a bicycle for Mars? Can you ride a bicycle on Deimos? Bicycles are lightweight and proved a reliable method ...
5
votes
1answer
83 views

How does gravity-gradient stabilization work?

I understand there is a stabilizing force due to gravity gradient. What I'm unsure about is the stabilization part. How does it work? It looks like to me that this tidal force would just make the ...
5
votes
2answers
93 views

When scientific and engineering data are sent from space probes, are the signals repeated to minimize transmission error?

I would think that this would be the case. In any one transmission there will be a systematic error due to the fundamentals of the transmitter / receiver. Is there also a transient or stochastic error ...
3
votes
0answers
58 views

Was this the first-ever photo of a full moon very close to lunar new year?

Limiting the concept of "lunar new year" to "Chinese New Year" (since there are many lunar and lunisolar calendars, the latter of which the traditional Chinese one is a widely used example), is this ...
-4
votes
0answers
35 views

Moon dust behavior [on hold]

Why do the experts say one thing about the behavior and presence of dust on the moon pertaining to the down firing rocket of the lunar lander, and the absence of debris clouds, or ground disturbance......
2
votes
0answers
64 views

“Luckily with no Lunar Module, Tidbinbilla was able to keep tracking with no interruption…” Why is no LM significant?

@PearsonArtPhoto's answer links to the page Apollo 8, 21 – 28 December 1968 by Hamish Lindsay at honeysucklecreek.net. The page describes a problem with one of the dish antennas that needed to be ...
0
votes
0answers
29 views

How many people spoke to Apollo 8 from outside the US?

@PearsonArtPhoto's answer links to the page Apollo 8, 21 – 28 December 1968 by Hamish Lindsay at honeysucklecreek.net. It shows a clipping from The Canberra Times front page, "With thanks to Mike ...
2
votes
0answers
25 views

Compute heliocentric ecliptic coordinates from Kepler's laws

I'm writing a program to compute the heliocentric ecliptic position of planets and asteroids. I want to output rectangular coordinates oriented according to the ecliptic: positive X in the direction ...
19
votes
1answer
3k views

What exactly turned on the light indicating Apollo 8 was starting to fall towards the Moon?

@PearsonArtPhoto's answer links to the page Apollo 8, 21 – 28 December 1968 by Hamish Lindsay at honeysucklecreek.net from where I have quoted below. Question: What exactly turned on the light ...
3
votes
3answers
502 views

Apollo Missions - Travel time to moon [duplicate]

I must be missing something - escape velocity is about 25,000mph. The distance to the moon about 240,000 miles. That computes to about a 9 hour flight. Why did it take 3 days for Apollo missions to ...
3
votes
1answer
1k views

What is that strange light ball appearing during launch of Russian Burevestnik nuclear-powered cruised missile?

In this video of the Russian Burevestnik rocket launch (uses nuclear power) 1) What is that light spot moving backwards (contrary to the rocket trajectory, backwards towards the launch fixtures): Is ...
11
votes
1answer
153 views

Opportunity's last tau was 10.8; what does that mean and how is tau defined and measured?

@ahiijny added a direct link to the Sol 5110-5114 MER B Downlink Report. These are the final days that signals were received from Opportunity. The message "Tau Value is NOT a Typographical Error" ...
2
votes
1answer
71 views

Can the top soil of the Mars be transformed to be arable, and how to do it?

Can Mars top soil be transformed to be arable, and how to do it? It may be planted in the isolated space.
1
vote
0answers
22 views

Air flow over an airfoil [on hold]

We know that in real viscous flow, boundary layer exists around the airfoil and there will be a separation point which flow starts to separate from the back of the airfoil( velocity gradient equal ...
4
votes
2answers
121 views

What would it feel like to walk on Venus's surface?

The conditions on Venus's surface are extremely harsh. I'm trying to conceptualize what it would be like to walk on the surface through supercritical carbon dioxide. Obviously we must neglect the high ...
1
vote
1answer
85 views

Can it be realistic to build a artificial magnetic field around Mars? [duplicate]

I was wondering how realistic it is to build an artificial magnetic field around Mars using electromagnetism. So my question is; what kind of current would be needed in a loop around Mars' equator to ...
9
votes
1answer
171 views

What was the last message Opportunity sent?

Everybody seems to be abuzz with the idea that Opportunity's last transmission was "My battery is low and it's getting dark." Of course, that would be a human interpretation of some sort of ...
5
votes
0answers
33 views

How to implement a relative motion STM without any numerical integration

I am trying to program the Gim-Alfriend state transition matrix. You can read all about it here. The GA STM is a complex analytical model that maps relative motion of a deputy satellite in a ...
2
votes
1answer
46 views

What would the full hypothetical Mars terraforming roadmap look like?

Most of all the articles about Mars terraforming focuses on warming the atmosphere. 2nd most popular topic as far as I know is the magnetic field that Mars lacks. Some other sources speak about toxic ...
2
votes
1answer
97 views

Is any feature of the Moon protected?

Perhaps this seems trivial, since it may not directly affect our planet, but if we ever colonize the Moon and mine its resources, the trace of human devastation will change sooner or later the surface ...

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